Ecosystem Test

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Ecosystem Test - 55

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Weekly Quiz Competition

Question 1
1 / -0

Identify the ecologist from the given hints.
(i) He carried out long-term ecosystem experiments using outdoor plots.
(ii) In his experiments, he showed that increased diversity contributed to higher productivity.

A
Ahmed Khan

B
David Tilman

C
Stanley Cohen

D
Earnest Chain

E
Herbert Boyer

Solution

George David Tilman is an American ecologist. It is said that a stable community should not show too much variation in productivity from year to year; it must be either resistant or resilient to occasional disturbances (natural or man-made), and it must also be resistant to invasions by alien species. David Tilman’s long term ecosystem experiments using outdoor plots show how these attributes are linked to species richness in a community. Tilman found that plots with more species showed less year-to-year variation in total biomass. He also showed that in his experiments, increased diversity contributed to higher productivity.
So, the correct answer is 'David Tilman'.
Question 2
1 / -0

Which of the following statements is INCORRECT?

A
The pioneer community in hydrosere are phytoplanktons

B
The climax community becomes unstable after environment changes

C
Both hydrarch and xerarch successions lead to mesic conditions

D
As succession proceeds, the number and type of animals and decomposers changes
Question 3
1 / -0

Entropy __________________.

A
Increases in a community undergoing primary succession

B
Requires no energy for doing work

C
Decreases in a community due to the action of decomposers

D
Requires an excess of energy to do work
Question 4
1 / -0

The rate of change of species composition among different stands of different forests is expressed by ________________.

A
Alpha diversity

B
Beta diversity

C
Total variability

D
Variability
Question 5
1 / -0

The upright pyramid of number is absent in ?

A
Aquatic

B
Grassland

C
Both a and b

D
Forest
Solution
Correct Option: C
Explanation:
- A forest pyramid of umber shows secondary consumers on the top.
- As we move down, there are the primary consumers and then, the producers.
Hence, the upright pyramid of number is absent in forest.
Question 6
1 / -0

In an effort to harness energy form biomass, which one of the following groups CANNOT be economically used as a direct combustibile fiber?

A
Paddy straw and cotton stalk

B
Bajra and wheat straw

C
Woody shrubs and urban garbage

D
Rice Husk and Bagasse
Question 7
1 / -0

According to Charles Elton, which is not correct?

A
Carnivores are at the top of the pyramid.

B
Energy trapping is high at the top of the pyramid.

C
Producers at the top of the pyramid.

D
Both B and C.

Solution

Correct answer-(D)
Charles Elton, an English biologist, developed the idea of ecological pyramids. These pyramids are therefore also termed as Eltonian pyramids. An ecological pyramid may be defined as a graphic representation of the numbers or biomass or status of accumulated energy at different trophic levels in a food chain in an ecosystem. The Eltonian pyramid is a concept which relates to food consumption efficiency. According to Charles Elton, carnivores are at the top of the pyramid. Producers are at the bottom of the pyramid. They manufacture food and provide nutrition for the next level. Energy trapping is high at the base of the pyramid, i.e., producer level. The energy is highest at the producer level as it traps energy from the sun. It gradually decreases as one moves to subsequent levels, i.e. herbivores and different carnivores.
Question 8
1 / -0

The four important steps of ecological succession consist of.
a. Invasion
b. Ecesis
c. Competition
d. Migration
The correct sequence in which these steps appear during primary succession is?

A
$$2, 1, 3, 4$$

B
$$1, 2, 3, 4$$

C
$$2, 1, 4, 3$$

D
$$1, 2, 4, 3$$
Question 9
1 / -0

Which of the owing statements regarding the maintenance of carbon cycle in the biosphere are correct?
a. Plant utilize solar energy to convert $$CO_2$$ and water into cellular materials and produce oxygen that animals consume.
b. Oxygen produced by the plants during carbon assimilation is not a byproduct.
c. Energy used by an animal comes from the oxidation of plant material releasing $$CO_2$$ that escapes into the atmosphere.
d. All decaying organic matter on the earth is ultimately degraded by molds and bacteria to yield $$CO_2$$ that escapes into the atmosphere.
Select the correct answer.

A
$$2, 3$$ and $$4$$

B
$$1, 3$$ and $$4$$

C
$$1$$ and $$2$$

D
$$1, 2, 3$$ and $$4$$
Question 10
1 / -0

Given below are the characteristic features of an ecosystem
(a) Little diversity
(b) Little cycling of nutrients
(c) High productivity
These features are correct for

A
Forest ecosystem

B
Cropfield ecosystem

C
Grassland ecosystem

D
More than one option is correct

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Ecosystem Test - 55

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Ecosystem Test - 55

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SHARING IS CARING

Question 1

Ahmed Khan

David Tilman

Stanley Cohen

Earnest Chain

Herbert Boyer

Solution

Question 2

The pioneer community in hydrosere are phytoplanktons

The climax community becomes unstable after environment changes

Both hydrarch and xerarch successions lead to mesic conditions

As succession proceeds, the number and type of animals and decomposers changes

Question 3

Increases in a community undergoing primary succession

Requires no energy for doing work

Decreases in a community due to the action of decomposers

Requires an excess of energy to do work

Question 4

Alpha diversity

Beta diversity

Total variability

Variability

Question 5

Aquatic

Grassland

Both a and b

Forest

Solution

Question 6

Paddy straw and cotton stalk

Bajra and wheat straw

Woody shrubs and urban garbage

Rice Husk and Bagasse

Question 7

Carnivores are at the top of the pyramid.

Energy trapping is high at the top of the pyramid.

Producers at the top of the pyramid.

Both B and C.

Solution

Question 8

$$2, 1, 3, 4$$

$$1, 2, 3, 4$$

$$2, 1, 4, 3$$

$$1, 2, 4, 3$$

Question 9

$$2, 3$$ and $$4$$

$$1, 3$$ and $$4$$

$$1$$ and $$2$$

$$1, 2, 3$$ and $$4$$

Question 10

Forest ecosystem

Cropfield ecosystem

Grassland ecosystem

More than one option is correct

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